She is the mistress of King Louis XV. She is secretly committed to the revolutionary cause in France. She is somehow involved in the murder of Lia de Beaumont and seeks to foil all D'Eon de Beaumont's actions.

He is a French revolutionary and a villain. He is committed to overthrowing the monarchy and establishing a new regime in France. He also has mysterious, supernatural powers. He flees to Russia to escape detection and arrest.